Hello @j2dw,
Thank you for writing to us.
1) You can hide application form by customization in file
simple-job-board\templates\v1 or v2\single-jobpost\job-application.php.
Note: v1 is for classic layout and v2 is for modern layout, please select v1 or v2 according to your settings configuration. Please do not change the plugin core files directly instead use the templating features because updating the plugin will override your current files. We recommend you please take help from a WP expert for these modifications.
2) You can also purchase the How To Apply Add-on from our marketplace.
Please go through the add-on description & documentation tab and make sure it provides your desired functionality before you purchase it.
Feel free to reach out if you need further assistance.
Regards,